Skip fretting system 53 3 17

This layout allows someone to play in 53-edo on a 17.666-edo guitar, by tuning the guitar in major thirds -- that is, with 17\53 between each pair of adjacent strings.

The diagram below, which could be interpreted 20 frets of a 12-string guitar, shows where each of the 15-limit harmonics lies. Since 53-edo is mostly (see below) for the exception consistent in the 15-limit, these harmonics' positions imply where every interval in that group lies. (For instance, to play 7/6 you move up one string and down one fret, because that takes you from harmonic 3 to harmonic 7.) Octaves are indicated as powers of 2 (specifically 1, 2, 4 and 8).

The exception to the above consistency rule of thumb is the ratios 11/7 (and its octave-complement 14/11). Since 11:8 is 7.9 cents flat and 7:4 is 4.8 cents sharp in 53-edo, the distance between them is 7.9 + 4.8 = 12.7 cents too wide. 12.7 cents is more than half of 53-edo's step size of 22.6 cents. Thus whereas the diagram below suggests that 11:7 is 34 steps wide, in fact 53-edo's best approximation to 11:7 is 35 steps wide. But that best approximation is still 10 cents sharp, so both approximations are roughly equally wrong, just in opposite directions.

   20 frets of a hypothetical 12-string guitar tuned this way:

                       headstock
                       this side
            1  5  -  -  -  -  -  -  -  -  -  -
            -  - 13  -  -  -  -  -  -  -  -  3
            -  -  -  -  -  -  -  -  -  1  5  -
            9  -  7  - 11  -  -  -  -  -  - 13
            -  -  -  -  -  -  -  -  -  -  -  -
            -  -  -  -  -  -  -  -  -  9  -  7
            -  -  -  -  -  -  -  3 15  -  -  -
   bass     -  -  -  -  -  1  5  -  -  -  -  - treble
   strings 11  -  -  -  -  -  - 13  -  -  -  - strings
   this     -  -  -  -  -  -  -  -  -  -  -  - this
   side     -  -  -  -  -  9  -  7  - 11  -  - side
            -  -  -  3 15  -  -  -  -  -  -  -
            -  1  5  -  -  -  -  -  -  -  -  -
            -  -  - 13  -  -  -  -  -  -  -  -
            -  -  -  -  -  -  -  -  -  -  1  5
            -  9  -  7  - 11  -  -  -  -  -  -
           15  -  -  -  -  -  -  -  -  -  -  -
            -  -  -  -  -  -  -  -  -  -  9  -
            -  -  -  -  -  -  -  -  3 15  -  -
            -  -  -  -  -  -  1  5  -  -  -  -